CC-PAIM01 51405045-175
CC-PAIM01 51405045-175
CC-PAIM01 51405045-175
:祖巧麗
:
1. 輸出方式的選擇
開關(guān)量輸出模塊有三種輸出方式:繼電器輸出、晶閘管輸出和晶體管輸出。繼電器輸出的價(jià)格便宜,既可以用于驅(qū)動(dòng)交流負(fù)載,又可用于直流負(fù)載,而且適用的電壓大小范圍較寬、導(dǎo)通壓降小,同時(shí)承受瞬時(shí)過電壓和過電流的能力較強(qiáng)。但它屬于有觸點(diǎn)元件,其動(dòng)作速度較慢、壽命短,可靠性較差,因此,只能適用于不頻繁通斷的場(chǎng)合。當(dāng)用于驅(qū)動(dòng)感性負(fù)載時(shí),其觸點(diǎn)動(dòng)作頻率不超過1Hz。
對(duì)于頻繁通斷的負(fù)載,應(yīng)該選用雙向晶閘管輸出或晶體管輸出,它們屬于無觸點(diǎn)元件。但雙向晶閘管輸出只能用于交流負(fù)載,而晶體管輸出只能用于直流負(fù)載。
2.輸出接線方式的選擇 按PLC的輸出接線方式的不同,一般有分組式輸出和分隔式輸出兩種,
如圖5-16所示。
分組式輸出是幾個(gè)輸出點(diǎn)為一組,共用一個(gè)公共端,各組之間是分隔的,可分別使用不同的電源。而分隔式輸出的每一個(gè)輸出點(diǎn)有一個(gè)公共端,各輸出點(diǎn)之間相互隔離,每個(gè)輸出點(diǎn)可使用不同的電源。主要應(yīng)根據(jù)系統(tǒng)負(fù)載的電源種類的多少而定。一般整體式PLC既有分組式輸出,也有分隔式輸出。
3.輸出電流的選擇
輸出模塊的輸出電流(驅(qū)動(dòng)能力)必須大于負(fù)載的額定電流。用戶應(yīng)根據(jù)實(shí)際負(fù)載電流的大小選擇模塊的輸出電流。如果實(shí)際負(fù)載電流較大,輸出模塊無法直接驅(qū)動(dòng),可增加中間放大環(huán)節(jié)。
4.同時(shí)接通的輸出點(diǎn)數(shù)量
選擇輸出模塊時(shí),還應(yīng)考慮能同時(shí)接通的輸出點(diǎn)數(shù)量。同時(shí)接通輸出的累計(jì)電流值必須小于公共端所允許通過的電流值。如一個(gè)220V/2A的8點(diǎn)輸出模塊,每個(gè)輸出點(diǎn)可以通過2A的電流,但輸出公共端允許通過的電流不是16A(8X2)通常要比此值小得多。一般來說,同時(shí)接通的點(diǎn)數(shù)不要超出同一公共端輸出點(diǎn)數(shù)的60%。
5.輸出的zui大負(fù)載電流與負(fù)載類型、環(huán)境溫度等因素的關(guān)系
表1為FX系列PLC的輸出技術(shù)指標(biāo),它與不同的負(fù)載密切相關(guān)。另外,雙向晶閘管的zui大輸出電流隨環(huán)境溫度升高會(huì)降低,在實(shí)際使用中也應(yīng)注意。
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